Definitions for "PHEROMONE"
Or ectohormone – chemical substance (highly volatile organic acid or alcohol) effective in minute concentrations, emitted into the environment as a signal to another organism (usually of the same species); important in social behaviour (cohesion, pairing, marking, coordination) (Isaacs et al., 1991).
any chemical which is secreted externally by an animal or insect and which influences the behaviour of other members of the species.
A chemical secreted externally by some animals that cause specific responses in other animals e.g pheromones secreted by bitches in heat will stimulate others in close contact to also come on heat.